SMPW-SMP-HMP-HMPW

Supported Applications

The Omega Miniature Thermocouple Connectors (Types SMPW and HMPW) are designed for heavy-duty construction to provide reliable electrical connections in thermocouple circuits. These connectors feature color-coding compliant with ANSI and IEC standards, facilitating identification of the specific thermocouple type being used.

Key functional features include:

• Quick Connect Contact Washers: Enable rapid connection changes without tools for certain configurations.
• Internal Wire Divider: Separates positive and negative leads to prevent shorting within the connector body.
• Combination Phillips/Slot Screws: Provide secure termination points using standard screwdrivers.

Type HMPW connectors are noted as environmentally friendly and cadmium-free. The series accepts stranded or solid wire up to Size 20 AWG.

Operating Conditions & Performance

The service temperature range depends on the specific housing material selected:

• Type SMPW (Glass-Filled Nylon): -29 to 180°C (-20 to 356°F). Note: Minor discoloration of the connector may occur between 150°C (302°F) and 180°C (356°F), though electrical properties are not affected.
• Type HMPW (Liquid Crystal Polymer): -29 to 260°C (-20 to 500°F).

These connectors support a wide range of thermocouple types, including ANSI designations J, K, T, E, R, S, and B. Type U (uncompensated) connectors are specifically used with Type B thermocouples (Pt/6%Rh-Pt/30%Rh). OMEGALLOY® is generically known as Nicrosil-Nisil.

Configuration Options

The series offers extensive configuration options across housing material, window availability, and thermocouple alloy compatibility. Model numbers follow the format: Alloy Code - Compensating Alloy Used in Connector (+ and -) - Shell Color - Glass-Filled Nylon Model Number w/Window (SMPW-*) or Liquid Crystal Polymer Model Number w/Window (HMPW-*).

Housing Materials

• Glass-Filled Nylon (Type SMPW)
• Liquid Crystal Polymer (Type HMPW)

Thermocouple Types and Shell Colors

• Type K: Yellow (CHROMEGA® / ALOMEGA®)
• Type T: Blue (Copper / Constantan)
• Type J: Black (Iron / Constantan)
• Type E: Purple (CHROMEGA / Constantan)
• Types R/S: Green (Copper / RNX/SNX)
• Type C: Red (CPX / CNX)
• Type U: White (Copper / Copper)
• Type N: Orange (OMEGA-P® / OMEGA-N®)

Ordering Options

• Specify "M" for male connector only or "F" for female connector only.
• Non-Window models are available; consult Sales for details.

Key Product Differences

The primary distinction within the series is the housing material, which dictates the maximum operating temperature. Type SMPW utilizes Glass-Filled Nylon and operates up to 180°C (356°F), while Type HMPW uses Liquid Crystal Polymer for operation up to 260°C (500°F).

Connectors are available with or without a removable/reversible write-on window. The "To Order" table indicates that both SMPW and HMPW series support the same thermocouple alloy codes, but differ in their model prefixes based on material.

Available Accessories

• Silicone Wire Grommet (SR-SMP)
• Quick Connect Contact Washers: CW-SMP-20 (pkg of 20) or CW-SMP-100 (pkg of 100)
• Removable/reversible write-on window (WCP-S, pkg of 5)
• Crimp Style Brass and Stainless Steel Bushing: Available in sizes to fit 0.020 to 0.125" and 1.5 and 3.0 mm diameter probes